Multi Streaming Data and Multiplexing to disk

Hi, I am trying to figure out what value I should assign for parameter 'Maximum Concurrent Jobs' when configuring storage unit. How can I come up with a value for 'Maximum Concurrent Jobs' that will best optimise performing backups for my setup?

I am storing backups onto a disk storage unit as part of disk stage 1. The disk storage unit is a ZFS config and consists of a VNX connected over fibre to netbackup media server.

My understanding is that multiplexing is used for backing up hosts to tape drive. So if I firstly backup to disk first what value should 'Media Multiplexing' be set to in the Atributes tab when setting up schedule.

Also if I use multi streamed backups to disk and then relocate images to tape later will this have an affect on restores? Do I have have to perform a Multi-streamed restore?

If you write 5 stream from e.g. a database backup to disk, all stream will write concurrent. But when the data is staged to tape and you need to restore the data from tape it will be restores as if it was a single stream of data. Netbackup does not have the logic to spread multiple stream to disk to multiple tape drives.

Yes - two tape drive from two storage unit can be put in a storage unit group.

As Marianne says i think the original question has been answered but let me clarify and cover the drives too ...

When writing to disk the maximum number of streams is governed by the storage unit itself only so the number you set here is dependant on the capability of your backup server (disk speed, memory and network)

The multiplex value in a schedule relates to tape backups only.

When backups are duplicated from disk to tape they run one image at a time and so do not multiplex onto the tape - as a result you do not need to set a multiplex level for tape if using disk staging

Your output shows two tape drives - the first shows UP but i do not see a status for the other one. If it is also UP and does not have a tape stuck in it or anything similar then as long as you tape storage unit is set to have 2 concurrent drives in it both should be used

Hope all of this helps

Authorised Symantec Consultant

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